The difference between permanent magnets and electromagnets

- Nov 13, 2017 -

Permanent magnet is no external magnetic field, can maintain their own long-term magnetic objects. In contrast to the electromagnet, the electromagnet will be magnetic when current passes, and if the current is cut off, the magnet will disappear. The wire wound into a coil, it is like a magnets, there are N and S pole, this is a simple electromagnet. Electromagnets, like permanent magnets, have two poles that attract iron, but unlike permanent magnets, the poles and the size of the magnet can vary.

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